摘要：Fire-tower is effectively applied in forest fire prevention and commanding system, especially in fire monitor and position. After explaining the significance of scientific planning of fire-tower, this paper analyzes gis`s functions in building forest fire prevention system. This paper uses case study method, which designs a model, fire tower planning and analysis, based on Mapgis platform. After that, it directs us how to realize these functions based on Mapgis-TDE which is a 3D platform belonged to Mapgis. This paper gives us scientific ways to fire tower planning in forest fire system which promotes informationization of forest fire prevention management.